/* ========================================================================
 * Bootstrap: carousel.js v3.0.0
 * http://twzui.github.com/bootstrap/javascript.html#carousel
 * ========================================================================
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ========================================================================
 * Updates in ZUI:
 * 1. support touch event for touchable devices
 * ======================================================================== */


+ function($) {
    'use strict';

    // CAROUSEL CLASS DEFINITION
    // =========================

    var Carousel = function(element, options) {
        this.$element = $(element)
        this.$indicators = this.$element.find('.carousel-indicators')
        this.options = options
        this.paused =
            this.sliding =
            this.interval =
            this.$active =
            this.$items = null

        this.options.pause == 'hover' && this.$element
            .on('mouseenter', $.proxy(this.pause, this))
            .on('mouseleave', $.proxy(this.cycle, this))
    }

    Carousel.DEFAULTS = {
        interval: 5000,
        pause: 'hover',
        wrap: true,
        touchable: true
    }

    Carousel.prototype.touchable = function() {
        if(!this.options.touchable) return;

        this.$element.on('touchstart touchmove touchend', touch);
        var touchStartX, touchStartY;
        var that = this;

        /* listen the touch event */
        function touch(event) {
            var event = event || window.event;
            if(event.originalEvent) event = event.originalEvent;
            var carousel = $(this);

            switch(event.type) {
                case "touchstart":
                    touchStartX = event.touches[0].pageX;
                    touchStartY = event.touches[0].pageY;
                    break;
                case "touchend":
                    var distanceX = event.changedTouches[0].pageX - touchStartX;
                    var distanceY = event.changedTouches[0].pageY - touchStartY;
                    if(Math.abs(distanceX) > Math.abs(distanceY)) {
                        handleCarousel(carousel, distanceX);
                        if(Math.abs(distanceX) > 10) {
                            event.preventDefault();
                        }
                    } else {
                        var $w = $(window);
                        $('body,html').animate({
                            scrollTop: $w.scrollTop() - distanceY
                        }, 400)
                    }
                    break;
            }
        }

        function handleCarousel(carousel, distance) {
            if(distance > 10) that.prev();
            else if(distance < -10) that.next();
        }
    }

    Carousel.prototype.cycle = function(e) {
        e || (this.paused = false)

        this.interval && clearInterval(this.interval)

        this.options.interval && !this.paused && (this.interval = setInterval($.proxy(this.next, this), this.options.interval))

        return this
    }

    Carousel.prototype.getActiveIndex = function() {
        this.$active = this.$element.find('.item.active')
        this.$items = this.$active.parent().children()

        return this.$items.index(this.$active)
    }

    Carousel.prototype.to = function(pos) {
        var that = this
        var activeIndex = this.getActiveIndex()

        if(pos > (this.$items.length - 1) || pos < 0) return

        if(this.sliding) return this.$element.one('slid', function() {
            that.to(pos)
        })
        if(activeIndex == pos) return this.pause().cycle()

        return this.slide(pos > activeIndex ? 'next' : 'prev', $(this.$items[pos]))
    }

    Carousel.prototype.pause = function(e) {
        e || (this.paused = true)

        if(this.$element.find('.next, .prev').length && $.support.transition.end) {
            this.$element.trigger($.support.transition.end)
            this.cycle(true)
        }

        this.interval = clearInterval(this.interval)

        return this
    }

    Carousel.prototype.next = function() {
        if(this.sliding) return
        return this.slide('next')
    }

    Carousel.prototype.prev = function() {
        if(this.sliding) return
        return this.slide('prev')
    }

    Carousel.prototype.slide = function(type, next) {
        var $active = this.$element.find('.item.active')
        var $next = next || $active[type]()
        var isCycling = this.interval
        var direction = type == 'next' ? 'left' : 'right'
        var fallback = type == 'next' ? 'first' : 'last'
        var that = this

        if(!$next.length) {
            if(!this.options.wrap) return
            $next = this.$element.find('.item')[fallback]()
        }

        this.sliding = true

        isCycling && this.pause()

        var e = $.Event('slide.zui.carousel', {
            relatedTarget: $next[0],
            direction: direction
        })

        if($next.hasClass('active')) return

        if(this.$indicators.length) {
            this.$indicators.find('.active').removeClass('active')
            this.$element.one('slid', function() {
                var $nextIndicator = $(that.$indicators.children()[that.getActiveIndex()])
                $nextIndicator && $nextIndicator.addClass('active')
            })
        }

        if($.support.transition && this.$element.hasClass('slide')) {
            this.$element.trigger(e)
            if(e.isDefaultPrevented()) return
            $next.addClass(type)
            $next[0].offsetWidth // force reflow
            $active.addClass(direction)
            $next.addClass(direction)
            $active
                .one($.support.transition.end, function() {
                    $next.removeClass([type, direction].join(' ')).addClass('active')
                    $active.removeClass(['active', direction].join(' '))
                    that.sliding = false
                    setTimeout(function() {
                        that.$element.trigger('slid')
                    }, 0)
                })
                .emulateTransitionEnd(600)
        } else {
            this.$element.trigger(e)
            if(e.isDefaultPrevented()) return
            $active.removeClass('active')
            $next.addClass('active')
            this.sliding = false
            this.$element.trigger('slid')
        }

        isCycling && this.cycle()

        return this
    }


    // CAROUSEL PLUGIN DEFINITION
    // ==========================

    var old = $.fn.carousel

    $.fn.carousel = function(option) {
        return this.each(function() {
            var $this = $(this)
            var data = $this.data('zui.carousel')
            var options = $.extend({}, Carousel.DEFAULTS, $this.data(), typeof option == 'object' && option)
            var action = typeof option == 'string' ? option : options.slide

            if(!data) $this.data('zui.carousel', (data = new Carousel(this, options)))
            if(typeof option == 'number') data.to(option)
            else if(action) data[action]()
            else if(options.interval) data.pause().cycle()

            if(options.touchable) data.touchable()
        })
    }

    $.fn.carousel.Constructor = Carousel


    // CAROUSEL NO CONFLICT
    // ====================

    $.fn.carousel.noConflict = function() {
        $.fn.carousel = old
        return this
    }


    // CAROUSEL DATA-API
    // =================

    $(document).on('click.zui.carousel.data-api', '[data-slide], [data-slide-to]', function(e) {
        var $this = $(this),
            href
        var $target = $($this.attr('data-target') || (href = $this.attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
        var options = $.extend({}, $target.data(), $this.data())
        var slideIndex = $this.attr('data-slide-to')
        if(slideIndex) options.interval = false

        $target.carousel(options)

        if(slideIndex = $this.attr('data-slide-to')) {
            $target.data('zui.carousel').to(slideIndex)
        }

        e.preventDefault()
    })

    $(window).on('load', function() {
        $('[data-ride="carousel"]').each(function() {
            var $carousel = $(this)
            $carousel.carousel($carousel.data())
        })
    })

}(window.jQuery);

